Thursday's inflation report was supposed to settle the argument inside the Federal Reserve. It did not — and that is exactly why Bitcoin's ability to hold $80,000 matters. The September PCE price index, the Fed's preferred inflation gauge, rose 0.5% on the month and 3.6% from a year earlier, up from 3.4% in August. Core PCE, which strips out food and energy, rose 0.3% on the month and...